Malicious PDF — malware analysis report

Static analysis result for SHA-256 009022ce8a150f9a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 18:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee8ee0ad4e310256ce3f817bc4227b4e SHA-1: 4a9abb5419e51178a790f470911833654c334010 SHA-256: 009022ce8a150f9a944cca91237428217a9bb99e3483fde6a21237758f571352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on potentially compromised or disposable domains. The primary purpose appears to be distributing further malicious content or manipulating search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://crystal-lamp.ru/uploads/files/88873286725.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2013e5f6a08214d2719ced56c55b14e2/funirotamomi.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/voxabuvobubatikopovota.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/serikuburamalaf.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/93012189841.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd3aef68c---fafimajariribufefu.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/48873949354.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336bfb7e78---kaleku.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/potub.pdfIn PDF document text
    • http://kezmosas.hu/files/file/jubosurulabezizu.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/19/toxuzagezopa.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/latunisowokewubed.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nexowupewabidemilurabeba.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/magiderimida.pdfIn PDF document text
    • https://camphacement.vn/upload/files/nalijesomus.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/16161426176.pdfIn PDF document text
    • http://thehbbq.com/uploads/files/luririb.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gizajumux.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23981677943.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/pikivubimetitoseb.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/fapebesuk.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/96844378041.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/widifuw.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/70523354059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+latest+version+apk+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 10764 bytes
SHA-256: cc513c0c758c947b6fe14c0164647e7064204f96c3def3d9e48c84ca16d08843
font_01_sfnt_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 14652 bytes
SHA-256: c5d8b965ee9d7db595113c0bfba559771be5afa2f08e70a7da9a65c2ce69b15c

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